4 "like a wound working on a foreign body to the surface of the skin"
-this shows that the world wants to heal and move on
-the simile "wound" personifies the earth as being injured
-and comparing the soldiers to being "foreign" empathises that they shouldn't be there
-it also shows how unnatural it is for them to die that young
-and is also implies that they weren't known
-also its suggests that the world wants people to know about the soldiers that sacrificed their life for others